Income Taxes (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Oct. 02, 2015	Oct. 03, 2014	Sep. 27, 2013
Income Taxes [Line Items]
United States tax rate	35.00%	35.00%	35.00%
Foreign tax rate difference	$ (120.9)	$ (77.3)	$ (49.8)
Federal research and development tax credit	11.0
Adjustment to previous tax returns		0.7	$ 1.9
Decreases relating to settlements with taxing authorities	$ 0.0	20.9
Benefit to tax expense		20.4
Tax benefits, reduction of foreign income tax expense		4.6
Income tax holiday	Sep. 30, 2020
Impact of tax holiday	$ 26.6	$ 12.6
Impact of tax holiday on diluted earnings per share (in dollars per share)	$ 0.14	$ 0.07
Valuation Allowance, Amount	$ 65.2	$ 60.8
Tax benefit to recognize if valuation allowance is reversed	65.2
Future taxable income needed to utilize deferred tax assets	144.2
Federal net operating loss carry forwards	$ 9.9
Operating loss carryforwards, expiration date	Dec. 31, 2035
Tax credit carryforward	$ 6.4
Valuation allowance not recognized	$ 6.3
Tax credit carryforward, expiration date	Dec. 31, 2030
Undistributed earnings of foreign subsidiaries	$ 1,175.5
Total unrecognized tax benefits that would impact the effective tax rate	66.7
Previously unrecognized tax benefits related to the expiration of the statute of limitations	0.1
Accrued interest or penalties related to unrecognized tax benefit	1.6
Foreign Tax Authority [Member]
Income Taxes [Line Items]
Valuation Allowance, Amount	11.7
State and Local Jurisdiction [Member]
Income Taxes [Line Items]
Valuation Allowance, Amount	53.5
Tax credit carryforward	$ 53.4
UNITED STATES
Income Taxes [Line Items]
Open tax year	1999
CALIFORNIA
Income Taxes [Line Items]
Open tax year	1999
CANADA
Income Taxes [Line Items]
Open tax year	2008
MEXICO
Income Taxes [Line Items]
Open tax year	2009
SINGAPORE
Income Taxes [Line Items]
Open tax year	2011